package com.fair.concurrency.example.atomic;

import com.fair.concurrency.annoations.ThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLong;

/**
 * @author 朝花不迟暮
 * @version 1.0
 * @date 2020/9/21 9:40
 * AtomicInteger原子常量
 */
@Slf4j
@ThreadSafe
public class ConcurrencySafeExample
{
    //请求总数
    public static int clientTotal = 1000;
    //同时并发线程数
    public static int threadTotal = 50;

    public static AtomicLong count = new AtomicLong(0);
    public static void main(String[] args) throws InterruptedException
    {

        ExecutorService executorService = Executors.newCachedThreadPool();
        Semaphore semaphore = new Semaphore(threadTotal);
        CountDownLatch countDownLatch = new CountDownLatch(clientTotal);

        for (int i = 0; i < clientTotal; i++)
        {
            executorService.execute(()->{
                try
                {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (InterruptedException e)
                {
                    e.printStackTrace();
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        log.info("count:{}",count.get());
    }

    private static void add(){
        count.incrementAndGet();
    }
}
